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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc50705843c53728a1bda6ca896720073c856fe6223e305a9455fac84dec8ea' 
  AND token = '3F1lMwmzZb5yNHK0HWaqaVgh7khOixdYq56J/sl78h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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