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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050f7e8e5628380c690f963db665ba977e74a0f33b208db28f17305434bad0d5' 
  AND token = '4bxgT9IfkmU94I3DbXugCyZpqWReuUrsUY2kHnndM3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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