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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c7a0ff69f948e9baa4bbc4f6141fa1c0a867fd0046643c0ea6f4a6a9890807' 
  AND token = 'KVvjgJRWk5DhC16vgNrM1kEUIY3UhVr3iqlzxBB0zaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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