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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28dffeab16c1d0deacce59867e27513e16f8ef49b6cf7e07be0efc6315bb9b6' 
  AND token = '5NDwQGcvh4aOyKeazDvh90J/nN9THQsAhfHvO72MjsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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