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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f6ea674a9c84afaadc7058b4ab862be566c894497ac1bdc0c9529af39f0a514' 
  AND token = '5rlp3jXCPzpXm9V29Q1fYi8N0jgb8jttN1UAr0RBPC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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