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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c255939107f0a7d036f07d935a25ea0faa24b7161adf55964604ef408c93529' 
  AND token = '2S1jsUsUonY2M5z7EdPjoEVbFo3mv0XkIyxGR7xU3kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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