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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034d6856715a7c7abab3dd478ea2f6605e65d0a6e56e5da69a4b941d5bc08edf' 
  AND token = 'kPv0OK2aD22zuz0Y6qTXoIfjHh2CwGvbav2668xGylM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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