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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66624db46529a7ec954178319c21a311fbc6f134c3cc426a06f733f98f85ca66' 
  AND token = 'OF0FNuyG3xHCwyKWxnxyLOla3W6frg5XAyBVF7o6Dv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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