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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db3e2fb6f4a325fe963c6f830537489b4c252f5cd3ee18f5e937f447aa11a89' 
  AND token = 'r+iJ83D7xTgN4B6BPUo6eql5fkIRCV5XFwOz9kCHeEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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