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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5ab9d375e635c0be81d1bbd13f22e7027eb9747bbf785bd0e4397b797faddf' 
  AND token = 'mgOhEFKApmcabszUi8U/l4BBU7eyXNN+XGMF2cW1LGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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