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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b683cd8bdfb6b4935ae2f5f42fbcad606bcce5163a263faf14e4fec92b9852b8' 
  AND token = '38B8i1/su8j5DfZ4byf8c1L1atNv1oGREBSr+NCx6aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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