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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c3b0557b69932d9102faf1041e57ec633b884137e87a7e5f004584eeacb91c' 
  AND token = '1ZGOD42yKudSh1CDwGsDd5TzdxXBw1fmEXTTQEbLOCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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