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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bee3d85ec126de5831cabd99421290a2fcbd17a32f32754a5c99b5f455197f' 
  AND token = 'sUYDeL0ZO9OT9A0M/y1dMHbKMY3OF1YmcO/z7ZDxTNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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