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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a8859c692fd81de079eedb45c2d1b8fd2bcef2d6937a09d9f2d6bee8f1699ac' 
  AND token = 'tBeIrrRGNtNuQeDhLpme80iWRWOHIH5ADzQgOf2f+rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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