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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db3a4992cae92c7298554f6350937d05d81db754784ae91ee320f4ab1fba88d' 
  AND token = 'TCxDlweQ49VGw4NNe9jg/hxD2sWJ0EiBZdFYlS0/B20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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