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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904ae0a684d94c421bcba32dcf4d783be4c0f50960ab523f68025bdfb8e2b0df' 
  AND token = 'SAvSJmLW9g1jxJpTQu20HqprvHJZiIzbF/gdZTtNRg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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