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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19021509a214448b3066afe54a1046f5590f60ea12ab0e08414c16635cb35c3f' 
  AND token = '06B3+81RAAtEO2HVKlUUdFamaxyIO0esnSQu+0OzoeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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