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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0da0523e3f221b81d12b4569c5a7163fe10c7a2356de4eb878ceb4016b98b6e' 
  AND token = 'JMr1ewABF0t97XbGrmkYzTR0N02CDTADg6LPpnJbMWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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