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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a90a4a4f0044a5100f40b9113fc50d7bf303dabde11b0a53a7513fe6e300871' 
  AND token = '8CQEQqu6xjtifDzNxNq0wcAaCIsZTQh5Cu9m9s54cE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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