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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d83b8a1f34488160dcfb251f1e0f94a87c9e1c984973c58363547edd59ca32d' 
  AND token = 'A0CeuksSVxJrcR0GcmJiUYfN6ue4OjdRsonKCdHnVAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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