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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8edfda9f0974f793b3d2e94a3ef0675b7b5c797fb1393d49935d37c8c7bcecc' 
  AND token = 'WzuGhYdl/iPdifJh0WBF2g+uNz/QHcGchH9QFyZMz+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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