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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c336be8eaaec9320aabb74e6843fa6a0e8a018682e71caa4b8d7ac062a9b3c0' 
  AND token = 'RMSrawrtp/Iq4mbc7jIblG5Y3YEYyBlqJtbZrCKQErU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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