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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94837d3dacd5018af75ae2d40a79b60a8f5636a83ce8bb6980fc70ed118f8707' 
  AND token = 'WCvshlV3EdN+tN20GppDItE+DcaaQJlLO/1qUy2PNKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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