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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75a258678d003cccd402220b831b470f58a28d78e49928d8ab6608b17006a96' 
  AND token = '4WS0eyaT0b921q3/r6SlZejl/ch0+GmTD/mgeRFlJWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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