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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aba20064b79a77d747f3252c1955a7e04f7b0ee4160f348c7b6f0920fc0bfc4' 
  AND token = 'tLUx1YTjv0cI9tNv7DLto5sLiE01j3+KT6jSeAvLcMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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