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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df12f63d0b004c36857864c0ce36327375cfd8c55fb3bd9458dc3dfdc38dcbe3' 
  AND token = 'zNonqRXO8tyF9BeIqEp9UgYzLWEPmea+RRaxlSGurQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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