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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91116e9fdfce065577f8da898a41ee8c80eb88a228b4f09b8b41833c05ff9a3' 
  AND token = '2MdQU/WirGpz/85wuPVzP48hclrNpqIVHeP0e6ZyfJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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