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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34feb513eea9d17f2fec3b7cdf0bccf12e7004ae364822e6f9b5f17e49753d71' 
  AND token = 'dCfr1a3FIcKLm5ZQjjAgJhsxWpyIV1Jadb2CufR3Bq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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