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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d70f291cab9519fd607c3ae5b04ac2cd70128af2ba09fd6cea048ec181f694' 
  AND token = 'ux62hqlW/eXiJcuutyxRj41JDPZdV6dxUQK3CH9dBtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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