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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5f88974cb70326cfb89fcb3e0103de98d658572f8b8cbc941d77af30eeee77' 
  AND token = 'AOF1gAziEwI73IJlYIsRzVPnOVfavB98DwtO4x9ifNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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