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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ce327e80c5c1deba8a178fd711ae7cd6b6eaa0c435bfcc2c45f5b31d60b940' 
  AND token = 'R1jw1nVgp82loPrnfj2GQkWGxYsJwrHeo2HGWT1918g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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