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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '992fab681c9803be8e44e64792b006f1dd760dc68ebfceaff8c82ac5447cdea5' 
  AND token = '67tK+bjyNURfrTR78b5v0ZRgwNkOsh1qs0gI/wk8m7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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