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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54cd3992081ac972cf3525308bd378d53c179b5efb6e26edfbcf6c0a186efec5' 
  AND token = '8bUOz6ktYjWhuhlWzAzJnZ6Ql9Tzn5r2AgPYXKryyOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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