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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95baf7651cda2e98ddf6dac11af0322abcba775cdcb7afd74784cb18dfcc35a' 
  AND token = '6JVCw1RMkz8iDKtGvXwuesB/t7GzTkkQ2SBYtWEx74Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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