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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f34911211ca5c90ee800ae6ae4500f131cc7a3a223594893f8e3de4d637f9bd' 
  AND token = 'lnYqvRQE3qQKQTKN4U3McWcd6gHVndVa2bs5kTSgK70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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