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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980312e7dc5e7f0df09c398c9bc3b800814eaa10ce8c4b63ffcd4859824596fc' 
  AND token = 'bUNvU0/tqyUBVGcSRM8OwFp2AlOVJSuzU7ApT2xBwxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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