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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb91cd3ca81c7b62cf55fb2bf09bd4294a8d2072a884c278b02c1fa21d4f0ee' 
  AND token = 'Hnqd1W7j+Ia6zB4HPVucH/xjCeZS6Grlnzk8PDFiWdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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