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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33bb093d2389814e5e07f01b163b4e38d92ccbe249d1dc97b445bf2d9ba19b1' 
  AND token = '04iV2BdbJosIQJpEW+C0DnodY58F3vL5KsH1AGRTdUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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