SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa276d08235183ecfb328c321b9deae6662e20eea6e4502ddb1588779d4cc3f6' 
  AND token = 'vKngpv9w5TDPO4+q12oAkmBCtuiX/aT1DLzzr4CtdKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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