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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34304ed4bc22222e62e4ebd204ed3a5d0295641326311f48eb05bc8fe2c4d2d' 
  AND token = 'Sbeu1UY54XT7WxdGqH255Uu8wdAkoJ6Z65WGdxAXn+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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