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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128872cedbfbbd7e1f3eeb626916faba6c114d5174e3c3bb7febd4c625b7f60e' 
  AND token = 'V7zGMSQ1P10od8XfRj1mMb3UcLJ1evaz0G7IKnJ/UiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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