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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b4e1906ffee90db349a8d16ec01f8e33d115c6e6e9d153dc3cbfb5b6ed8e66' 
  AND token = 'mpcxGqGpFF+LHjNisp3Z9no8+VAecxKIvkqJtVVMN1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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