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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3fe9a541e83f5c4e62f0731389a214aea6ae5e40c2ac8eae251837a6670902' 
  AND token = '58yWtchiUpU2q6MD670TTweimHQQ3m2yjid0F7rJ3k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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