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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd7d9a711b0807ea5a044d4b4f70f09754fa343dd1d8e6ca1d54ab921deba90' 
  AND token = '9g0cX8mdtVWdup9yXrIWfsFfEEXs8JWa9vPHGv/u6wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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