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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84cea2b9c650a6a46468b4901f43ab364daeb6dbfb32502b1ed8c311182e8a55' 
  AND token = 'qviVdfZIlcfpx2tIOnwn2RLrDXR+/l1nHX8bJAgNh4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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