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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c5668a0ff6b64960bc5bba296fd9b42c38defd05d16c759bdb471af55cfe69' 
  AND token = 'N/L2tqe6rPU90Wl5zE7Zw0IRIYDeSbQFGjeGp0uM/dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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