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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6df3bb2d11eaa0170e60e0b6c8680e2f2396d24ecbd7bbe8258d7d140d59826' 
  AND token = 'Gg40K0U+Vp2LYU3yizzpaTLXtpI2UenUzpgWfDb3QjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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