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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2adc0c9c8c0353c9da56ad02e5d45f330060f62b23f63fb219f8449dc4586e9f' 
  AND token = 'x9UDgoMilADIIyAo0O0lrXjb7Q3TXzDlvpqNk4YiqhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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