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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c985e2f7447cdc58eb6eb1e0ea0d862f9a715d50581d049d70ed1db48957c3' 
  AND token = 'zddKDXTWypbqHT1pcFriBvJhoTP4h84+PqNTEfGhCyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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