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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01091594aa3e14e5ba83ea4f5b03d685604d9f87f45fd96162d0a68e3c5c8287' 
  AND token = '7zhW6/ReRd8c6b1UbwDgCPEXZjqKkGaIUtkUc9n6oAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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