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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac1ceb5f70f6e6b6daf3112859ab902dbf7447968dd3dedd9a80bf7dd5bb8a8' 
  AND token = 'BkEocmbRGgLadVO8gkPZGlS4d4IYQpruAOIz0NO/458=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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