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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820494c0d8d6a875c15f03a0dc682439709df2bfd390faa0e2bd465ab6e3175c' 
  AND token = '7Yxmt9Y2FSqHxeJ7ytCOI6Qx5M9a0Z3Es0Y6xnzwXtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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