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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40c389af900a63f36f6a3c5e72eaa0e099f1f7a3b23237f6017b79faa101c7f' 
  AND token = '6pVkSjAGi32rf1LkxCvZ0CDbSegAc/JG1nk637Z7fUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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