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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b71caa9eda162b2c8a948305ce918c34e832b6babc66b5f797f34fbd44ce32' 
  AND token = 'Ivs0l+Ubp5/4VL6bQRM4ofaoDww4BeaO2OHYpsv9iB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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