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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930a8162002e8a7ca5b23f8f715cda644e0a01fbf150299b829278aaed4a9aab' 
  AND token = '1FeWO6jZ1oY4mnYsa0+lRMQ3k1bOD03qvZrILDQ01oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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