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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a2524f1a0a3c05e7426b52a4dff0fc81cdcfe56616c097a67670b7bd2c8ddc' 
  AND token = '2MszxUlRAB4KuJPon3uAto2goGlcTY4cqeQrpiSksdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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