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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8a1457ece494f42815a67c148c283d7c5a81fe2ffb7e123eb1292c9ebcfeb1' 
  AND token = '4+U0FtlXgfwSGIBmQ2bpgbf+vaVyojYrwa5ubd+ATCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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