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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae06a6d41d61a7ce2f6572dd6cf1a84279bbbeeca45a3ae1f1a6b79e52107838' 
  AND token = 'YXCXHRIHy+NZh1HRy8XTneU1RodtAZ7E0U7juvLX39I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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