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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6626343579b1b51e6f19dcad694e6c5f1c30461d0071e8dbad33c3e1ccd379' 
  AND token = 'TNFn21TTCTlcohEqs4xnYV4n2v/fa79WfuHacpu0J6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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