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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5029eeaf087323166d6f78351b544a02d6fc13b7467610efb636443d5e43f89' 
  AND token = 'kaTJIbMqtIn7H6A4a9HIMqDXgCsTQT98/A0GYy5SpTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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