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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f90c9b9c6459bcbc9c856bfc7050b4d991ec3c3c171c3b882ebb951624d37c0' 
  AND token = 'hvHfz/lOs+LsL/9147E+pkIFqDWImmfjOCdjbVgGxJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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