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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f469c5cac7e168b3e10abc636fdb2a92013f743b9a19a78f61ccd78c4d994f8a' 
  AND token = 'YngMfsJX/GgZ3eQ1qerby9AxZPxIo0NgeMNjkB+9Euc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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