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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1bfb6247f066266adf71a697891d497390b1e2b08b6d8e713c6660b0587a29' 
  AND token = 'BvnxNIKxbkyt6Hu3LGTpGmiGtNfK7GreU6TgHi2tMHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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