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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60232e356737c348dc341b3c8a6d6e88fde0004e145beaa3b5a21dffb1a070ee' 
  AND token = 'FiWE+XGBEsCo8WCvN1Kf/q4RA3v/l1oSg7a5HqoHFY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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