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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4712f68e5bb3bf68498573436a4aae757fb43c871697c460381c5f40ed45f0f3' 
  AND token = '1WfndfUyOTF2TKkirfl1yBegnPW2BuuAmdCrkevvQKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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