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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f891429790e8ca62ec3661507bfbe4e553a8fc3a58ce9c59deab687f197f0dc' 
  AND token = 'VES3GY7KoYFMNz4dU3yXnYZ8PW3vsfnjLb9v2nX8X6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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