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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba758b2606b0d64503666cdabfcab4864d29ccdc2089ad417c96794ee6fe746' 
  AND token = 'aJm/zIfXU3XGAJlFuOSsETbKpsAY3sNhKij03DZCQkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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