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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2153d32bf773611abb30892c856261648dcf52919d8c400adf5cb70919de3af7' 
  AND token = 'KUtPCas+N+tWU60XAZ5dt/hWtWma1SHg08PgazK4tyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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