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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdf84d59ac59726ea568aed2759ca2ca2fb32612eb0e81538ee7cb38f5b857f6' 
  AND token = 'mnF7JR9aaBW2ivuWWfKCF6N7JWDfd5yDg/LAfdZBwXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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