SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e7c36a869c8931b6b0b4243de18aac8cf37b87fd308eab05877b9098442593' 
  AND token = 'pw+1CJIq5NRvjWotOz34BSnH/r5kLnulo90JPgBABLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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