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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d4c1d1fd82612a83097716bb87a26697bb3cbed34dac1719dfc4fd8ce3ff58' 
  AND token = 'cTMQa3HjJ/voVtv96TyUWgldjg1uY8XVMnr+oktxW3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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