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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4baa0fa577f3d7164679150e568df61db8d1b673e5826bc2f25c03147a0e86e' 
  AND token = 'wu3WLw6OD/b97QCkeqMP7r2r8xwndHiHyyNhdtasmWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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