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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4db79c8aa35b844c3659c02b3bd9e523aea7a4603518af63366549a3d027d46' 
  AND token = '3PCEkB2TM95RTWNe/AYikg4KIfxGISic3z8GWwl5c40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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