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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a73adff5ba7d7d9797d12bf5963e07cb795a71c735e9e757a6dfc19defd225' 
  AND token = '2kjRK2VOgwluUBNtXl7PqUDs4A1C+lLirdohADah3Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00425

JSON explain

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