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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744d78c570104ec44faee6ccc0087dda66d69da72d216f924daaa7b04133fec5' 
  AND token = 'sZlJujQs8yiPSaRzgeFO7/KPisp+afY+61k0V67HQFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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