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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c624c34d09c811810a17653e562d89c280b73207ad4175d8bb7d40681ca36f3d' 
  AND token = '8LsnulmgCmAfRe0lghsv3eh49S/nAdNIlDNStBD9vEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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