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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31374057b81228abca047bf17c3419d2086d9b32ae3d41223df3d1ad4054af71' 
  AND token = 'WH/WXTvLGYGfxKp6CDP6r6XXkcVWI9YNQaNlyQR6ePM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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