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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47be44fc69c0b86d97a727b3ec4efe965876451ad02ba5eb0676f5a9456e110a' 
  AND token = 'nW9OrabBebkp/IBArM7wg17aPINSjWn+pT8I+Wnh110=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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