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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afda6ed4adafb481e1faabdbd2caf807f52ab1ce5f3d63e2be53d6f8ab09257b' 
  AND token = 'az3o1vIseo7LDxuu2jUgkFPBeMmsFe1fFbh9O5++yJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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