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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea78feda7b0dc92eba176b7e9bd91b750f6e5438fccd640bfb13cbcc747cb98' 
  AND token = 'QxLsyezJbGi9Fpm+kp3iTE/WAIhTrxZ2Q3nbloiR+cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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