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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dfa49992f648eec187c8b353ac07ac49aa8827fdbda32c39b00c55b85624649' 
  AND token = 'Y936vN70Qerys8Rw7yLIbGYKAq4zJoVT3IyNiLfg560=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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