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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48612801091794e99845597c0fb7986ad464fe6278c2cd708a731fae89ae28ee' 
  AND token = 'S7tdN6/l+iluaXtRcQnTu/tv6nRrwG4tiXnVtE+/y90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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