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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a64e35ee8ddbc702e10ebea095b4d23e8d5933a7f6c23ca2a733374940cdd9' 
  AND token = 'cegAdNmdsS10DWCLnCyye4hM+VpeKEq+E5o+RH7AjUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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