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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2115ff7d4f6b2ff722c61bb9bf842dc2ed7df817ec981b9b7cabdb8cb30246c7' 
  AND token = 'UMiHqiojuIgq3VJjRcoxm8iFJkBOY4cxxy9HErOZs4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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