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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558c10953f281ac5c56976a9c0865147b1ed43b34b65ceaec38cf01705689cd7' 
  AND token = 'KMsABM/Nb8/FrMJcBemrUHo0dc/FT7iN0Ajui0iZnSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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