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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b35550b8bbd51e2a3e7b1654a1707eecc6bfbbe44d3844e31ae329391710aab' 
  AND token = 'nDeVEry5rcF4FZ7lpvbOLKr0VXVL1wgO1PC3SKU/cjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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