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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb7b9f6449b31ac9959ceaaf767025865b3eb926e8c8e97fbb7db95fae8b488' 
  AND token = '9w+aKCWOfDqYdHaWIlZ0fYvhMR0jWS3aVaaBIG227RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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