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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9f2f906ca3ddda6c67bccb86a701731fef925b478b971b897510b604bc1e51' 
  AND token = '056EvK0NrQPI9uutHVU75siroOM+h2H9dj6cMjR4ZtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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