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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6926fc972d20cd41f504312775f3371c12b0bf07f7ed419ac40e4c8b45bd450d' 
  AND token = 'BFfNBWyXHscvDYVzwKMnVAhC89MOSL7p3AwMtXxR5XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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