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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98fc081d23fe9467d2610a4fe7a66a2f53163bbf061f80f270b9fafa16da20d' 
  AND token = 'IdD3B1c4nkXgvwm/OPxBFosBUK9+LN7ky2WNRfWklL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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