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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b3d8ad2734682f2e6144c718e869c14ab38615cd82842d16adf7f96e6d90f63' 
  AND token = 'Gu3eU7A+PJWDbwyhWoo4TFQ4AGaZnaXeqXXx5NO//hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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