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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd55914af9d3695ad97d7355e094b55ca1a7391ceff301df50b50fca3392c82' 
  AND token = '5KpFbq3pa3oOWvV5QMjxHyQD8WH8Y+tPihOJXTGM9yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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