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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc95f4841c67687f556a8d2a2b1f95e13a50fe40e87d92ad32dc461db2bb4da' 
  AND token = 'K/AtkIYB3SSOIN28VryQTb+ayVNxThcUEIvGZIPe5Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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