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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9824dad40f28c5c4d9919aeb22eaff49d0b09c24b355c4ad2aff36d557d4fde' 
  AND token = 'hOTAxaih27U4UbHiUMaNrHCcADRGIols7YUUqBz5B5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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