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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96bd2781a266862e39755f84b09a5fc1ad7e667ceb1c64b46dbac7c8efdea142' 
  AND token = 'ItMQgyXwUa8x9AWlP1sHAMa1tUskqT0fdNrGSJ9hya8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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