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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9decb240e6547399d74fa49bdc905b1aff2990b1cc3e76e400c68287ed114ef' 
  AND token = 'hZS+zKurSwbmlA9DRp2TiTxFSDYa1Vm3eHGvOmZavrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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