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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6955d96a4bf775c4af99069df67606bbb318bbb57091ac806080f82b25efe3e2' 
  AND token = '8AwPB6D1avokbMne3scu8cHo9n9cAXTEfbr0yv45zr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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