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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9cfeb2e039f2099cd2c74d0738c5328efda32681b9f3c45c29c225d67cc868' 
  AND token = '2QFZqzdofVJ6PfyeXARRNAZua8WKdygogLKhz3BNwwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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