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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007db2f62b0a4d6fcbe7f3baf8c32763254cfdbd1af8f49bfc3394fbc1f25f76' 
  AND token = 'K9vOc1ehDw0HEFBGGESXejKVPqFMr6pocxkqPQDjU4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}