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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c89c3af328f2526ae71c63fb902b054d94ca66d2dddd2d99cc6224b2b15f87d' 
  AND token = '9XBK6clbzYaaxkIAnsPCBoyUZsRJAWtlwn/E8W6WHkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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