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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe730352884a7a793de4b90d5937b7d3c6ac676d28009240e4aee52ab074ffa3' 
  AND token = 'sokQM++Rk9UmZe9cLkIQmXgu77UCo7gJ0oR5hHD4XdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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